The MA37 (more formally Individual Combat Weapon System, Caliber 7.62 mm, MA37) is an air-cooled, gas-operated rifle firing 7.62x51mm ammunition. It is magazine-fed and is capable of fully automatic fire. The MA37 (MA5 for Marines and Navy) first entered service with the UNSC in 2437, it has remained the primary service rifle of all branches of the UNSC ever since.